Hollow casing speae



May.19, 1931. w. H. VREELAND HOLLOW CASING SPEAR Filed June 23, 1930Inventor \A/zltiam H. Vrplazza La -"y Attorney Patented May 19; 1931"AppI-tcafion' mea June 19, smut masses:

My invention. relates to a: hollow spearftoroil wells; I .1;

' The? object at my invention is toeproviflega casing spear that. ishollow", hyf whiclvmeans below the spear for the; purposes at inserting;and discharging explosivexelemaenh. also:

stopsicentnolling: engagement of. timesslips'.

As fi'urther object oatmy invention: is. to pm viid'e hollow casing.spear." havingsfinten n changeable toothed slips: on. the-Slowernemxleoil. fields as the builz'elog type; thespear: being; hollow and;havingaz removable element on the upperend thereof functioning 2(1'38' astop, by which-.mean'ss.(should'thezpendeent' supporting means become:severed; while: drawing a casing) ,thespeanwill be supported. by the"resting. ontheiupp'en ofithe casingethereby avoidingfthezlossiafthespearri' 2e whiclnotherwise'would'descendatothebottom U y I I theshps, Ihave. arrange a fnusto-conical; nosefi to threadedl'y. engage.with block. 6,; and. to, aotas. a. retainer for. the slips "when.

of thaws-11:. These'aandi other" objects will henei naiten be more. anyexplained, Reference being had to the accompanying drawings forming apart g of this specification, in which like characters.

apply to like parts in the different views.

\eferring to the drawings, w I Fig. 1 is a side elevation of the hollowc asing spear showing with dotted linesthe'longitudinal aperture,therethru, and having one of the slips removed for convenienceofillustration. 7 Fig. 2, is a sectional view taken on line 22 inFig. 1. i

Fig. 3 is a side view of one ofthe slips whichserve as clutching devicesand enable the spear to firmly grasp the casingwhich is to be drawn fromthe Well.

F ig; 4 is a side elevation of the casing-in section, the hollow casingspear resting thereon, in position to remove said'casing.

Fig. 5 is a sectional view taken on line 5- -5 f in Fig. 2.

My invention herein dlsclosed consists of a shaft 1 serving as aconnecting means between 4. on the rear side. thereof; adapted to;slid-ably;

unscrewing nose m mber, the slips may, he nemovejd lorlreplaced. by aset suitable V rings-.25. 23am 2f'.- threadedl y engaging oni 1 theappen'endthereof, and a plurality of; slide;-

ahleitoothedelements 3? as hereinafter dea scribed at the lower endthereot, said shaft being composed; of various, conventionali. threaded:pipe fittings, ofsuflicient length to. properly space" the aforesaid.rings and. slidable elements;- Seid slidable elements 3,; whichv Ishall; cal slips, are of. wedge shape shown, in Fig. 3,,with. astrapezoidal tongue engaged-n a gJIGOVGfi? in; each .ofthe' sides: of-a ypyramidal block ,6 forming a dovetail joint,

e w e s p i -h i nd t s ve 'es faces toremain substantially inparallelism, with'the axisotthe'shait; huttol move inwardlyand,outwardly withz nespectto-the longi z tudinalaxis. as. the-slipsmove up;and down their respective grooves 5 Dotted lines show the-slips at theirupper: extremity, and show theinward movement. ojiithe outer facets vthelzeofi Said faces of 'the. slipsane oflsegi mentalwitl1-.a-;plnrality of horizontal; rows ofupwardily pro'ecting, teeth threon.

As a means; to. easiiy re laceor. exchange. 7

they' are. in operative positionc By simply to t a difi'erentsihecasing, Likewise,;.

gringz beunscrewedl and replaced by: an.-; other WlllClI will adapt. pm.of? the spear to various, sizes/of. well} casi To avoid s5; ofthe slipswith thecasingi the; same are supponted upwardly, asnshownwby;the'dnttedlinesfi, thru the medium, of a. pair of jointed detentscomposed of arms; l2lrigid 11y connectedhy of aplnrality of rivets 13,said, d'etents. diametrically positioned. to, suppol fflie oppositelypositioned; slips re Y spectivel yah which, meansgthe spear may bewithdmawm i i'om, thecasin'g, shoi'lld' it be ad-1 visable' to do} soprior to an attemptt'o draw the same,.. ,a.nd to cause engagement of theslips; whmh' aretlieco'nnec' ting; medium (A weight suspended by acableis lowered hen. the H llow and'sljlbwed td-"drop with: violent force;the o'f 'shearing therivets 13 and breaking the detents which are thenfree to drop downward allowing the said slips to slide downward to snugengagement with the inside of the casing by the expansion caused b theshape of the block hereinafter describe It will be understood that byreason of the ring elements on the upper end of the shaft, the spear isstopped thereby as it rests on the upper end of the casing.

It will be noted that an aperture 9 extends longitudinally the entirelength of the spear. Re erring again to the ring elements, it will beunderstood that rings 2 and 2" are of different diameters externally andare separated by a ring element 2" all of which threadedly engage on areduced portion on the upper end of the shaft as shown in Fig. 1. Thelower ring 2' has its outer corners'slightly bevelled as at A to assistthe said ring in passing into a casing that will engage with the ring 2as shown 1n-Fig. 4. The ring 2 will function as a stop for the spearwhen the casing that is to be withdrawn is slightly larger than theshaft thereof and having both rings attached as shown in Figs. 1 and 4to accommodate for two sizes of casings at a time. The extreme smallsizes of casings are illustrated in the drawings. When the largercasings are being drawn larger rings proportionally will be applied tothe spear. v

Suppose a section of well casing has been lost or broken off within awell. My device may be lowered from the surface by a pendent supportingmeans 10 composed of joints of easing threadedly engaging in the upperend ofthe shaft 1. The conical nose, and upwardl projecting teeth of theslips will allow t e spear to enter the upper end of the casing 11'until the ring, which is of proper size to prevent its further movement,will rest upon the end of the casing. When upward force 15 a the' s ipswill (when the detents are broken) cause the teeth 7 to clutch into thewalls of the casing, which ma thereby be hoisted to the surface. When te casing is 'ammed or imbedded so tightly that it cannot e removed bythis means, an explosive charge Blmay be lowered thru the hollow casingspear to a" point below the same, and be discharged as a means ofbreaking the casing for the removal of the upper Iportion thereof.

Although have shown and described certain details of arrangement of mydevice, I do not wish to be so confined, as various modifications may beem loyed as lie within the $00 e of the appends claims, and having fullyescribed my invention what I claim as new and desire to secure byLetters Patent 1. In a hollowcasing spear ofthe class describedcomprising an apertured pyramidal block and slips slidably engagingthereon, the apertures being diametrically positioned, a jointed detent,the outer ends of'which ex-' lied by the pendent supporting means,

tend thru their respective apertures and on lower end of the shaft, theblock having toothed slips engaging thereon, and a removable nosethreadedly engaging on the lowerend of the pyramidal block as a stop forthe extreme downward movement of the slips,a pair-"of jointed detentsdiametrically extending thru the pyramidal block and beingtransverselypositioned to each other, by which' means the toothed slips are retainedin their extreme upward movement, and released when the detents areremoved by breaking the same, substantially as described.

3. In a hollow casing spear of the class described comprising a shaftwith a reduced threaded portion on the upper end thereof, and apyramidal portion on the lower end thereof, and a toothed slip toslidably engage on each side of the pyramid, and a frustoconical nosethreadedly on aging with the lower end of the pyrami al portion, thepyramidal portion having two pairs of openings diametrically positionedand each pair in alignment, a jointed detent to engagein each pair ofthe openings so that the outer ends thereofprotrude as carrying meansfor the upper position of the slips, a ring with a peripherally beveledface, a second ring of a greater diameter than the first said ring, athirdring as a spacer between the first said rings, allthreadedlyengaging on the upper end of the shaft, for the purpose specified.

' In testimony whereof I aflix my signature. WILLIAM H. VREELAND.

